Re: JTAG multiple devices

I may be missing a major
point and do not understand why is there a plethora of JTAG devices
that are specific to a certain hardware or software.

Because many silicon vendors keep JTAG accessible hardware on their
chips which goes beyond boundary scan secret; then, they give the
data some "firm" which is allowed to collect a few thousands per
sold cable - or do it themselves. The cash they collect on that
is negligible, but once you give in they have you under control.
An astonishingly low number of people seem to object paying
ransoms like that.
If you can do all you need via boundary scan only, though,
there should be some cheap way to do it - open source or
whatever. (I cannot name any because the tols I use have been
written here and run under DPS which you don't have).

Dimiter

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Dimiter Popoff Transgalactic Instruments

http://www.tgi-sci.com
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On Aug 24, 11:21 am, amerdsp <amer...@xxxxxxxxxxx> wrote:
Greetings,
I am new to JTAG and and I am working on a project that that has an
Atmel AVR. I want to be able to use JTAG but have not bought any
programming/debugging devices yet. I would like to get something that
is compatible with other products that I see myself using in the
future such as FPGAs or other microcontroller families. I am on a
tight budget and I want to get something that will work with multiple
devices.

Additionally, if all the chips that I use adhere to the IEEE
standard, one JTAG device should do, right? I may be missing a major
point and do not understand why is there a plethora of JTAG devices
that are specific to a certain hardware or software.

Any help is greatly appreciated.

Thank you,

--A


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